The victim, a man estimated to be in his mid-30s, suffered a single stab wound to his chest, fire Capt. Shawn Youngman said. He was flown by helicopter to Los Angeles County-USC Medical Center for treatment of an apparently moderate wound.

Responding officers arrested a woman in on suspicion of assault with a deadly weapon in connection with the attack, Pomona police Lt. Eddie Vazquez said. Her identity was not released pending booking.

The suspect and victim knew each other prior to the incident, he said, however the relationship between them was unclear. No further details were immediately available.